名词
中文翻译：引力单位系统
同义词：
['gravitational system']
例句：
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1.The gravitational force between the planets is what keeps them in their orbits.
行星之间的引力力是它们保持在轨道上的原因。
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2. The gravitational pull of the Earth on the Moon is strong enough to cause tides.
地球对月球的引力足够强大，足以引起潮汐。
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3. The gravitational field around a black hole is incredibly strong and can bend space-time.
黑洞周围的引力场非常强大，可以弯曲时空。